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R Coronae Borealis

The very old yellow giant disappears every few years from our sight. Only the best telescopes then can see it. The star casts away its hull in thrusts. This hull is very rich in carbon and hides the star in a dusty cloud from time to time.
It is the prototype of the R Cor Bor stars, of which only about 50 are known. This phase in the life of some stars shouldn't last longer than only 1000 years.

Constellation: Corona Borealis
Distance: 4700 light-years
Spectral class: G0
Visual magnitude: 4.9 - 15
Mass: 0.8 * Sun

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    R Coronae Borealis
Photo: ESO Online Digitized Sky Survey

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